User's Manual

5-12 Viking™ VP600 Portable Radio Operating Manual
Conventional Mode Features
chosen as the talk back type. The radio transmits on the received channel if active group
is chosen as the talk back type.
Priority on Programmed - Priority sampling occurs and the priority channel or
channels are those programmed in the selected scan list. The radio transmits on the
selected channel if selected group is chosen as the talkback type. The radio transmits on
the received channel if active group is chosen as the talkback type.
Talkgroup - Monitors a single digital conventional channel. When a call is received,
the radio searches the scan list for a talkgroup that matches the received talkgroup.
Returns calls on the selected talkgroup if selected group is chosen as talkback type and
returns calls on the received talkgroup if active group is chosen as talkback type.
Vote Scan - Analog - Scan based on received signal strength (analog channels).
Vote Scan - Digital - Scan based on received signal strength (digital channels).
5.10.3 Priority Channel Sampling
The following describes priority sampling when scanning conventional channels.
Note Priority sampling when scanning SmartNet/SmartZone/P25 Trunked channels is
described in Section 6.10.
The priority channel sampling feature ensures that when priority scanning, messages on
the priority channel are not missed while listening to a message on some other channel.
The radio can be programmed as just described so that the priority channel is a fixed
channel programmed in the current scan list, the currently selected channel, or not used.
Note Priority channel sampling is not available when receiving analog encrypted (DES) calls,
nor when receiving unit calls. In addition, the priority channel is not scanned if the active
channel is an analog channel on the same frequency as the priority channel and is
programmed with CTCSS/DCS squelch control.
Either a single or dual priority channels can be programmed if desired. With dual priority,
a call on the second priority channel is interrupted by a call on the first priority channel but
not vice versa. When scanning and the selected channel is a single or first priority channel,
is indicated in the display. This indication is displayed regardless of whether the
priority channel is fixed or always the selected channel. When it is a second priority
channel, is displayed.
The priority channel sampling frequency is determined by the programmed Priority
Lookback Time A (see description which follows). For example, if 2.0 seconds is
programmed, the priority channel is sampled every 2.0 seconds when listening to a
message on a non-priority channel. When not listening to a message, the priority channels
are scanned in the normal scan sequence. With dual priority, the first and second priority
channels are alternately sampled at the Lookback Time.
The priority sampling times are set by programming.